747978889 has 8 divisors (see below), whose sum is σ = 868847168. Its totient is φ = 630614160.

The previous prime is 747978863. The next prime is 747978901. The reversal of 747978889 is 988879747.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 747978889 - 2⁵ = 747978857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (747978589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 875427 + ... + 876280.

It is an arithmetic number, because the mean of its divisors is an integer number (108605896).

Almost surely, 2^747978889 is an apocalyptic number.

It is an amenable number.

747978889 is a deficient number, since it is larger than the sum of its proper divisors (120868279).

747978889 is a wasteful number, since it uses less digits than its factorization.

747978889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1751775.

The product of its digits is 56899584, while the sum is 67.

The square root of 747978889 is about 27349.2027123278. The cubic root of 747978889 is about 907.7434283359.

It can be divided in two parts, 7479 and 78889, that added together give a palindrome (86368).

The spelling of 747978889 in words is "seven hundred forty-seven million, nine hundred seventy-eight thousand, eight hundred eighty-nine".